Home / 21,071.72-29,078.88-11,640.28

Finding the Fourth Proportional to 21,071.72, 29,078.88 and 11,640.28

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Solution

The fourth proportional to 21,071.72, 29,078.88 and 11,640.28 is: 16,063.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,071.72 : 29,078.88 = 11,640.28 : x
  2. Step 2: Convert to fraction form
    21,071.72/29,078.88 = 11,640.28/x
  3. Step 3: Cross multiply
    21,071.72x = 29,078.88 × 11,640.28
  4. Step 4: Simplify right side
    21,071.72x = 338,486,247.09
  5. Step 5: Solve for x
    x = 338,486,247.09/21,071.72
  6. Step 6: Final answer
    x = 16,063.54

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.